The ornamental design for a self-tracking rail, as shown and described.
FIG. 1 is a front perspective view of a self-tracking rail, showing my new design;
FIG. 2 is a front elevation view, the rear elevation view being a mirror image thereof;
FIG. 3 is a left side elevation view thereof;
FIG. 4 is a right side elevation view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof; and,
FIG. 7 is a front perspective view in an environment of use.
The claimed design is shown with a symbolic break in its length. The appearance of any portion of the article between the break lines forms no part of the claimed design.
The broken lines on FIGS. 1 through 6 show portions of the self-tracking rail, which form no part of the claimed design. The broken lines in FIG. 7 depict environmental subject matter and form no part of the claimed design.